/Engine/Source/Editor/UnrealEd/Classes/Editor/UnrealEdEngine.h
Replace all actors of the specified source class with actors of the destination class.
virtual void edactReplaceClassWithClass ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, [UClass](API\Runtime\CoreUObject\UObject\UClass) * SrcClass, [UClass](API\Runtime\CoreUObject\UObject\UClass) * DstClass )